• drop size*: 60 – 200 µm
• drop rate*: 20 – 80 kHz
• viscosity range 1- 50 mPas
• volume variation: approx. 2 %

* depending on the liquid

Dropjet – a combination of Microdrop and Nanojet technology – allows the generation of a large number of drops with a well-defined size. This is of interest in applications like micro-encapsulation, aerosol research, spray and micro-sphere production.

A jet is generated by pressurized liquid flowing through a nozzle. The jet is modulated by an integrated piezo actuator causing defined fluctuations of the jet diameter at the nozzle outlet. The fluctuations grow over time, constrictions are built and after a certain distance the jet disintegrates into droplets.

The drop volume is defined by the flow rate, the frequency of modulation and the nozzle diameter of the system. The smallest possible drop size - approx. two times the size of the nozzle diameter - is defined by the smallest wave length of the periodic fluctuation. The maximum volume is limited by the stable separation of the drops. At larger distances of the constrictions the liquid tends to separate into more than one drop with different volumes.